package per.example.arpproject.utils;

import lombok.extern.slf4j.Slf4j;

import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

/**
 * zip压缩工具
 *
 * @author wuhaixin
 * 2020年10月7日
 */
@Slf4j
public class ZipUtil {

    private static String destFileName;

    /**
     * 解压zip到指定路径
     *
     * @param zipFile 待解压文件
     * @param descDir 指定解压路径
     * @return fileNames 解压的全部文件名
     * @throws IOException
     */
    public static List<String> unZipFiles(File zipFile, String descDir) throws IOException {
        List<String> fileNames = new ArrayList<String>();
        ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK"));// 解决中文文件夹乱码
        String name = zip.getName().substring(zip.getName().lastIndexOf('\\') + 1, zip.getName().lastIndexOf('.'));
        File pathFile = new File(descDir + name);
        if (!pathFile.exists()) {
            pathFile.mkdirs();
        }
        String outPath = "";
        for (Enumeration<? extends ZipEntry> entries = zip.entries(); entries.hasMoreElements(); ) {
            ZipEntry entry = (ZipEntry) entries.nextElement();
            String zipEntryName = entry.getName();
            fileNames.add(zipEntryName);
            InputStream in = zip.getInputStream(entry);
            outPath = (descDir + name + "/" + zipEntryName).replaceAll("\\*", "/");
            // 判断路径是否存在,不存在则创建文件路径
            File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
            if (!file.exists()) {
                file.mkdirs();
            }
            // 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
            if (new File(outPath).isDirectory()) {
                continue;
            }
            // 输出文件路径信息
            FileOutputStream out = new FileOutputStream(outPath);
            byte[] buf1 = new byte[1024];
            int len;
            while ((len = in.read(buf1)) > 0) {
                out.write(buf1, 0, len);
            }
            in.close();
            out.close();
        }
        pathFile.delete();
        return fileNames;
    }

    /**
     * 压缩文件夹成zip
     *
     * @param srcDir           待打包的文件夹路径
     * @param out              打包文件名及存储路径
     * @param KeepDirStructure 是否保留文件夹结构 不保留则把文件夹下全部文件都打压在一起
     * @throws RuntimeException
     * @throws FileNotFoundException
     */
    public static void docToZip(String srcDir, String targetFile, boolean KeepDirStructure) throws RuntimeException, FileNotFoundException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        FileOutputStream out = new FileOutputStream(new File(targetFile));
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            /*destFileName = targetFile.substring(targetFile.lastIndexOf(File.separator) + 1, targetFile.length());
            System.out.println(destFileName);*/
            compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    log.error(e.getMessage(),e);
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    log.error(e.getMessage(),e);
                }
            }
        }
    }

    /**
     * 压缩成ZIP 将多个文件大包
     *
     * @param srcFiles 需要压缩的文件列表
     * @param out      压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void filesToZip(List<File> srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        int BUFFER_SIZE = 2 * 1024;
        try {
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                byte[] buf = new byte[BUFFER_SIZE];
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                int len;
                FileInputStream in = new FileInputStream(srcFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    log.error(e.getMessage(),e);
                }
            }
        }
    }

    /**
     * 描述: filesToZipWithName 打压缩包 文件名使用上传的原文件名 <br>
     * 传参: <pre>
     * List<Map<String,Object>> files = new ArrayList<>();
     * Map<String, Object> map = new HashMap<>();
     * map.put("file", new File(filePath));
     * map.put("fileName", cmsFile.getFileName());
     * files.add(map);</pre>
     * @param srcFiles 泛型为包装文件名（key: fileName）、文件（key: file）的集合
     * @param out o
     * @author 段友元(duanyouyuan)
     * 2022年06月02日 16:54
     */
    public static void filesToZipWithName(List<Map<String,Object>> srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        int BUFFER_SIZE = 2 * 1024;
        try {
            zos = new ZipOutputStream(out);
            for (Map<String, Object> srcFile : srcFiles) {
                byte[] buf = new byte[BUFFER_SIZE];
                zos.putNextEntry(new ZipEntry((String) srcFile.get("fileName")));
                int len;
                FileInputStream in = new FileInputStream((File) srcFile.get("file"));
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    log.error(e.getMessage(),e);
                }
            }
        }
    }

    /**
     * 压缩成ZIP 方法1
     * @param srcDir 压缩文件夹路径
     * @param out    压缩文件输出流
     * @param KeepDirStructure  是否保留原来的目录结构,true:保留目录结构;
     * 							false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void dirToZip(String srcDir, OutputStream out, boolean KeepDirStructure)
            throws RuntimeException{

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null ;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);

            compress(sourceFile,zos,sourceFile.getName(),KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) +" ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils",e);
        }finally{
            if(zos != null){
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    /**
     * 递归压缩方法
     *
     * @param sourceFile       源文件
     * @param zos              zip输出流
     * @param name             压缩后的名称
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws Exception
     */
    private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure)
            throws Exception {

        int BUFFER_SIZE = 2 * 1024;
        byte[] buf = new byte[BUFFER_SIZE];
        //System.out.println(name);
        if (sourceFile.isFile()) {
            //if (!destFileName.equals(sourceFile.getName())) {
                // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
                zos.putNextEntry(new ZipEntry(name));
                // copy文件到zip输出流中
                int len;
                FileInputStream in = new FileInputStream(sourceFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                // Complete the entry
                zos.closeEntry();
                in.close();
            //}
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }
            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress(file, zos, file.getName(), KeepDirStructure);
                    }
                }
            }
        }
    }
}
